package com.example.a02;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.context.annotation.AnnotationConfigUtils;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.annotation.Resource;

public class TestBeanFactory {
    public static void main(String[] args) {
        DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
        // bean的定义
        AbstractBeanDefinition beanDefinition =
                BeanDefinitionBuilder.genericBeanDefinition(Config.class).setScope("singleton").getBeanDefinition();
        beanFactory.registerBeanDefinition("config", beanDefinition);

        // 给BeanFactory添加一些常用的后处理器
        AnnotationConfigUtils.registerAnnotationConfigProcessors(beanFactory);

        // BeanFactory 后处理器主要功能：补充了一些bean的定义
        beanFactory.getBeansOfType(BeanFactoryPostProcessor.class).values()
                .forEach(beanFactoryPostProcessor -> beanFactoryPostProcessor.postProcessBeanFactory(beanFactory));

        // Bean后处理器：针对bean的生命周期的各个阶段来提供拓展，例如@Autowire @Resource ...
        beanFactory.getBeansOfType(BeanPostProcessor.class).values().stream()
                .sorted(beanFactory.getDependencyComparator())
                .forEach(beanPostProcessor -> {
            System.out.println("===" + beanPostProcessor);
            beanFactory.addBeanPostProcessor(beanPostProcessor);
        });

        for (String name : beanFactory.getBeanDefinitionNames()) {
            System.out.println(name);
        }

        beanFactory.preInstantiateSingletons(); // 准备好所有的单例
        System.out.println("------------------------------");
        System.out.println(beanFactory.getBean(Bean1.class).getBean2());
        System.out.println(beanFactory.getBean(Bean1.class).getBean3());

    }

    @Configuration
    static class Config {
        @Bean
        public Bean1 bean1() {
            return new Bean1();
        }

        @Bean
        public Bean2 bean2() {
            return new Bean2();
        }

        @Bean
        public Bean3 bean3() {
            return new Bean3();
        }

        @Bean
        public Bean4 bean4() {
            return new Bean4();
        }
    }

    static class Bean1 {
        private static final Logger logger = LoggerFactory.getLogger(Bean1.class);

        public Bean1() {
            logger.info("构造bean1");
        }

        @Autowired
        private Bean2 bean2;

        public Bean2 getBean2() {
            return bean2;
        }

        @Autowired
        @Resource(name = "bean4")
        private Inter bean3;

        public Inter getBean3() {
            return bean3;
        }
    }

    static class Bean2 {
        private static final Logger logger = LoggerFactory.getLogger(Bean2.class);

        public Bean2() {
            logger.info("构造bean2");
        }
    }

    interface Inter {

    }

    static class Bean3 implements Inter {

    }

    static class Bean4 implements Inter {

    }
}


